Paint cracking?

Decided to rattle can spray the door interior. It was a gloss black. Sanded it lightly with 150 grit, then 220, wet sanded with 400. Sprayed a filler primer and when it dried I got a bunch of the cracking. What do I do with this?48D72F0C-A6FF-4F41-B980-7BF2052A2B06.jpeg97DF6D4C-1827-4922-B0DE-A37875423CBE.jpeg